many points of view. in my opinion, the most normal, this is the game of your brain. you could see something similar, including in your dreams. and your brain deceives us into thinking that this is the case, exactly in exactly. you probably think about what that mysticism, I am sure there are similar responses. everyone is free to believe what he wants. but self-deception, can not be true.

Déjà vu is a feeling of familiarity, and déjà vécu (the feeling of having "already lived through" something) is a feeling of recollection.

What is the cause of deja vu?
One explanation for déjà vu is that there is a split-second delay in transferring information from one side of the brain to the other. One side of the brain would then get the information twice – once directly, and once from the 'in charge' side. So the person would sense that the event had happened before.

What does it mean to have deja vu?
Dear S.G., Déjà vu really is an uncanny feeling. The term in French literally means "already seen" and that's exactly why it's so unnerving: It really feels like you've already experienced a very specific event or been somewhere, even though you haven't (or, at least, you don't think so).